user6880336 user6880336 - 1 month ago 7
JSON Question

How to fetch a data from the database mysql using asynctask?

While fetching data in

TextView
I am getting an error. I tried but its not working.
my output image


Error parsing data org.json.JSONException: End of input at character 0


Json

[{
"0": "1",
"cl_id": "1",
"1": "",
"cl_department": "",
"2": "3G COMMUNICATION",
"cl_pname": "3G COMMUNICATION",
"3": "NIRAJBHAI",
"cl_salesperson": "NIRAJBHAI",
"4": "",
"cl_oname": "",
"5": "MOHMADBHAI",
"cl_contact": "MOHMADBHAI",
"6": "JUBELY SHAK MARKET",
"cl_address": "JUBELY SHAK MARKET",
"7": "",
"cl_city": "",
"8": "360001",
"cl_pincode": "360001",
"9": "",
"cl_bdate": "",
"10": "",
"cl_adate": "",
"11": "",
"cl_opening": "",
"12": "9376052000",
"cl_cnumber": "9376052000",
"13": "",
"cl_wnumber": "",
"14": "",
"cl_email": "",
"15": "RT40848",
"cl_wodcode": "RT40848",
"16": "",
"cl_active": "",
"17": "",
"cl_saleman": "",
"18": "",
"cl_bank_name": "",
"19": "",
"cl_bank_city": "",
"20": "",
"cl_ifsc_code": "",
"21": "",
"cl_bank_ac_no": "",
"22": "",
"cl_bank_ac_holder": "",
"23": "",
"cl_pancard_no": "",
"24": "",
"cl_visiting_card": "",
"25": "ACTIVE",
"cl_status": "ACTIVE",
"26": "",
"cl_aread": "",
"27": "",
"cl_target": "",
"28": "",
"cl_archive": "",
"29": "",
"cl_remaining": "",
"30": "A1",
"cl_group": "A1",
"31": "Om",
"cl_category": "Om",
"32": "",
"cl_credit": ""
},


Here is my complete code,

Main.java

public class MainActivity extends Activity {

private WebView wv1;
InputStream is=null;
String result=null;
String line=null;
JSONObject jsonobject;
public static String DATA_URL = "http://10.0.2.2/portal/fetchwod.php";
JSONParser jParser = new JSONParser();
JSONArray ownerObj;
ArrayList<HashMap<String, String>> arraylist;
ArrayList<String> delivery_fetch = new ArrayList<String>();
String suid,uid,wt_wod_code1,wt_party1;
TextView abcd,abc1;
View view;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new DownloadJSON().execute();
abcd =(TextView)findViewById(R.id.abc);
abc1 =(TextView)findViewById(R.id.abc1);
}

private class MyBrowser extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url ) {
view.loadUrl(url);
String id = abcd.getText().toString().trim();
return true;
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
return super.onOptionsItemSelected(item);
}

private class DownloadJSON extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}

@Override
protected Void doInBackground(Void... voids) {

try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/portal/autocomplete.php");
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.e("Pass 1", "connection success ");
} catch (Exception e) {
Log.e("Fail 1", e.toString());
Toast.makeText(getApplicationContext(), "Invalid IP Address", Toast.LENGTH_LONG).show();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
Log.e("Pass 2", "connection success ");
} catch (Exception e) {
Log.e("Fail 2", e.toString());
}
return null;
}

@Override
protected void onPostExecute(Void args) {
try {
JSONArray JA = new JSONArray(result);
JSONObject json = null;
final String[] str1 = new String[JA.length()];

for (int i = 0; i < JA.length(); i++) {
json = JA.getJSONObject(i);
str1[i] = json.getString("cl_pname");
}
final AutoCompleteTextView text = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
final List<String> list = new ArrayList<String>();

for (int i = 0; i < str1.length; i++) {
list.add(str1[i]);
}

Collections.sort(list);
final ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.my_list_item, list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_list_item_1);
text.setThreshold(1);
text.setAdapter(dataAdapter);
text.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
wv1 = (WebView) findViewById(R.id.webView);
wv1.setWebViewClient(new MyBrowser());
wv1.loadUrl("http://10.0.2.2/portal/on_target.php?=cod");
wv1.getSettings().setLoadsImagesAutomatically(true);
wv1.getSettings().setJavaScriptEnabled(true);
wv1.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
Toast.makeText(getApplicationContext(), (CharSequence) arg0.getItemAtPosition(arg2), Toast.LENGTH_LONG).show();
wt_wod_code1 = text.getText().toString();
wt_party1 = text.getText().toString();
abcd.setText(text.getText());
Log.d("wt_wod_code", wt_party1);
new getdata().execute();

}
});
} catch (Exception e) {
Log.e("Fail 3", e.toString());
}
}
}
private class getdata extends AsyncTask<Void, Void, Void> {

@Override
protected Void doInBackground(Void... voids) {
try {
String uid = abcd.getText().toString().trim();
arraylist = new ArrayList<HashMap<String, String>>();

List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("cl_pname", uid));
JSONObject json = jParser.makeHttpRequest(DATA_URL, "GET", params);

int success1 = Integer.parseInt(json.getString("success4"));
Log.d("success4", json.toString());

if (success1 == 0) {
Snackbar.make(view, "Not Data Found", Snackbar.LENGTH_LONG).show();
}
if (success1 == 1) {
ownerObj = json.getJSONArray("Ordera");
for (int i = 0; i < ownerObj.length(); i++) {
jsonobject = ownerObj.getJSONObject(i);
delivery_fetch.add(jsonobject.getString("cl_wodcode"));
}
}
}
catch(Exception e)
{
}
return null;
}
@Override
protected void onPostExecute(Void args) {
abc1 =(TextView)findViewById(R.id.abc1);
abc1.setText(delivery_fetch.toString());
}

}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;

}
}


Here is my Logcat,

com.example.sachin.addvisit E/Pass 1: connection success
com.example.sachin.addvisit E/Pass 2: connection success
com.example.sachin.addvisit D/wt_wod_code: D.K. METAL
com.example.sachin.addvisit D/response: {"success":1,"Ordera":[{"cl_wodcode":"RT34705","cl_pname":"D.K. METAL"}]}
com.example.sachin.addvisit E/Buffer Error: Error converting result java.lang.NullPointerException: lock == null
com.example.sachin.addvisit E/JSON Parser: Error parsing data org.json.JSONException: End of input at character 0 of


The data is displaying in the logcat but not fetching in the
TextView
.

I validated my
JSON
online an it looks alright.

i don't know where's the problem is please help me out.

if required i'll post my API too..

Answer

Parse the JSON as follows,

final String[] str1 = new String[JA.length()];
final String[] str2 = new String[JA.length()];

for (int i = 0; i < JA.length(); i++) {
    json = JA.getJSONObject(i);
    str1[i] = json.getString("cl_pname");
    str2[i] = json.getString("cl_wodcode");
}

Inside the OnItemClickListener,

text.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        String selected_cl_pname = str1[position];
        String selected_cl_wodcode = str2[position];
        abc1.setText(selected_cl_wodcode);

        // rest of your code
    }
});

I recommend to use a model class and use GSON to parse the JSON.

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